Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Help with 3.4l


Recommended Posts

3.4lpa 8-14-08

I have recently completed the 3.4l swap on a 98 boxster and the car runs great. I think the ecu is programed for a stock 3.4 and the rev limits at about 6600-6800rpm. Needless to say I think the car can be more aggressive than what it is. I also have Dansk 100 cel cats headers and ghl muffler. What do i need to do to get the most of this setup? Is the rev limit correct for a 3.4l

Thanks for any input

-Mitesh

Link to comment
Share on other sites

3.4 liter rev limiter is set at 7,300 RPM.

Which program (Boxster?) did they use on which DME (version)?

The DME is 5.2.2 version found on 98 boxster. I'm not sure which program you are reffering to

-Mitesh

Link to comment
Share on other sites

All this time I thought I had a 3.4. I will contact the guys who did the swap. Before I start going nuts. Is there a way to tell what program I have? or the fact that the rev limit is at around 6600 a good enough indicator that I have a boxster program. I'm not sure how the guys who did the swap are going to respond.

Link to comment
Share on other sites

If I do have the wrong program should I look into getting a performance program ie. Giac chip? or do I need carrera program 1st? Do I need to have the guys who did the swap reprogram the dme or can t be done at another Inde? Lastley are there any complications in trying to run a carrera program into my 98 DME. Maybe that is why the shop didn't do it, or it wasn't part of the deal...

-Mitesh

Link to comment
Share on other sites

Sorry Loren,

I looked at the thread but I didn't read it. Mainly becase I am not very mechanically inclined. I printed the pdf and tried to make sense of it. If my car is running the boxster program is it missing wires from the DME to the vac solenoid? resulting in me needing to -- have the DME redone, I can provide this service along with a new wire to add to the harness and instructions on calibrating the MAF to avoid running issues for $150 to contributing renntech members, $200 for non-contributing members.--- OR do I need to take my car in to A GIAC dealer and have them change the program.

Once again thank you for help

-Mitesh

Link to comment
Share on other sites

As a new member and one that is admitting up front that they don't have much mech. aptitude I will cut you some slack ;) but you really should search the multiple posts on this topic here. It is quite a popular subject.

If you have access to a porsche tester (PST2 or PIWIS) it is very easy to figure out if your DME is properly programmed as a 996. If it is, it will be recognized as a 996 and not a 986. You can also look and see if there has been an additional wire added to the connector that goes to the DME and runs to the actuating solenoid for the secondary plenum butterfly. Without this your 3.4L engine will not produce much more power than the 2.5L you removed.

As the soft rev-limiter is 6700 on a 2.5L boxster, I am pretty sure you are still running the 986 program in your DME.

Todd

Link to comment
Share on other sites

This is not as easy is i thought. I found the dme under the drivers seat. From reading your pdf I am to be looking for a wire installed in position 59. Very hard to tell. Do I have to remove the seat?? Is there no other way... Again I am mechanically challenged :D

-Mitesh

Link to comment
Share on other sites

This is not as easy is i thought. I found the dme under the drivers seat. From reading your pdf I am to be looking for a wire installed in position 59. Very hard to tell. Do I have to remove the seat?? Is there no other way... Again I am mechanically challenged :D

-Mitesh

the dme is not under the driver's seat, it is in the trunk.

Link to comment
Share on other sites

The DME is not under the seat (that is the alarm control) it is in the rear trunk behind the carpet panel.

post-1-1219180831.jpg

Found Dme now where is pin 59. Can I see it by just looking or do I need to pull something apart

--Mitesh

Link to comment
Share on other sites

  • Admin

Folks please READ the 3.4 liter Engine Swap PDF referenced in post 7 above.

There is only one engine carrier for a 3.4 liter -- and the engine mount is the same for all 3.4 and 3.6 liter cars.

post-1-1219460208_thumb.png

The A means the part has been replaced with an updated version.

Link to comment
Share on other sites

Actually Loren, it is 964 C2 mounts that are needed at the trans end on an engine swap as these mounts are taller and drop the trans end to match the drop at the front of the motor. You do not want 993 mounts as these are the same part as the 986/996 mounts.

-Todd

Link to comment
Share on other sites

Yep different part number! Thanks for the part number for the 964 motor mount. Unfortunately they cost 2x more then the 993 ones. And on top of that the ABS controller cost another 1600 bux....Jeez I am going to go broke doing this.

Link to comment
Share on other sites

Actually Loren, it is 964 C2 mounts that are needed at the trans end on an engine swap as these mounts are taller and drop the trans end to match the drop at the front of the motor. You do not want 993 mounts as these are the same part as the 986/996 mounts.

-Todd

Todd

I know you have done a couple 986 to 996 conversions. What do you think would be a fair price to put a 3.6 in my 2001 986 S. Please address the following: 1) Reprogram ECU, 2) Labor R & R and 3) Other fabrications etc (not incl 996 headers)

Thank you for your response.

Link to comment
Share on other sites

So back to pin 59..... Since no one in my area has the means to read my ecu program and the guys who did the swap are 3hrs away I figgured that

If a mechanic showed me the top of the intake manifold and i saw a valve actuator arm swing open after 3000 rpm then it would be safe to say that I have the right program. Right?

Link to comment
Share on other sites

open the engine lid, rev the car past 3k and the actuator on the second plenum should move. If that happens you don't have the 2.5L program, whether you have the right program is not guaranteed as the red line should not be as low as you previously state.

You may also want update your profile to indicate where you are located, there may be a member nearby willing to help you out.

-Todd

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.